Schema.org PropertyValue

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://schema.org/schemas/property-value.json",
  "title": "Schema.org PropertyValue",
  "description": "A property-value pair, e.g. representing a feature of a product or place.",
  "type": "object",
  "required": ["@type", "name"],
  "properties": {
    "@type": {
      "type": "string",
      "const": "PropertyValue",
      "description": "The Schema.org type."
    },
    "@context": {
      "type": "string",
      "default": "https://schema.org"
    },
    "name": {
      "type": "string",
      "description": "The name of the property."
    },
    "value": {
      "description": "The value of the property."
    },
    "propertyID": {
      "type": "string",
      "description": "A commonly used identifier for the characteristic represented by the property."
    },
    "unitCode": {
      "type": "string",
      "description": "The unit of measurement given using the UN/CEFACT Common Code."
    },
    "unitText": {
      "type": "string",
      "description": "A string indicating the unit of measurement."
    },
    "minValue": {
      "type": "number",
      "description": "The lower value of some characteristic or property."
    },
    "maxValue": {
      "type": "number",
      "description": "The upper value of some characteristic or property."
    },
    "measurementTechnique": {
      "type": "string",
      "description": "A technique or technology used in a measurement."
    },
    "valueReference": {
      "type": "object",
      "description": "A pointer to a secondary value that provides additional information.",
      "properties": {
        "@type": { "type": "string" },
        "name": { "type": "string" },
        "value": {}
      }
    },
    "url": {
      "type": "string",
      "format": "uri",
      "description": "URL of the property value."
    }
  }
}